export default {
	namespaced:true,
	state:()=>({
		cart:JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	
	mutations:{
		addToCart(state,goods){
			const findResult = state.cart.find(x =>x.goods_id === goods.goods_id)
			console.log(findResult)
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			this.commit('m_cart/saveToStorage')
			console.log(state.cart)
		},
		saveToStorage(state){
			uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
		updateGoodsState(state,goods){
			const findResult = state.cart.find(x=>x.goods_id === goods.goods_id)
			if(findResult){
				findResult.goods_state= goods.goods_state
				this.commit('m_cart/saveToStorage')
			}
		},
		updateGoodsCount(state,goods){
			const findResult = state.cart.find(x =>x.goods_id === goods.goods_id)
			if(findResult){
				findResult.goods_count = goods.goods_count
				this.commit('m_cart/saveToStorage')
			}
		},
		// 根据 Id 从购物车中删除对应的商品信息
		removeGoodsById(state, goods_id) {
		  // 调用数组的 filter 方法进行过滤
		  state.cart = state.cart.filter(x => x.goods_id !== goods_id)
		  // 持久化存储到本地
		  this.commit('m_cart/saveToStorage')
		},
		//更新购物车所有勾选状态
		updateAll(state,newState){
			state.cart.forEach(x =>x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		}
	},
	// 模块的 getters 属性
	getters:{
		 // 统计购物车中商品的总数量
		   total(state) {
		      // let c = 0
		      // // 循环统计商品的数量，累加到变量 c 中
		      // state.cart.forEach(goods => c += goods.goods_count)
		      // return c
					return state.cart.reduce((total,item)=>total += item.goods_count,0)
		   },
			 //已勾选总数量
			 checkedCount(state){
				 return state.cart.filter(x =>x.goods_state).reduce((total,item) =>total += item.goods_count,0)
			 },
			 checkedAmount(state){
				return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total += item.goods_count * item.goods_price,0).toFixed(2)
			 }
	}
}